mmc: sdhci: export sdhci_execute_tuning() (85a882c2) · Commits · 戴 / test

Some SDHCI-compat controllers support not only SD, but also eMMC, but they use different commands for tuning: CMD19 for SD, CMD21 for eMMC. Due to the difference of the underlying mechanism, some controllers (at least, the Cadence IP is the case) provide their own registers for the eMMC tuning. This commit will be useful when we want to override .execute_tuning callback (for eMMC HS200 tuning), but still let it fall back to sdhci_execute_tuning() for SD timing. Signed-off-by:

Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by:

Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:

Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -2100,7 +2100,7 @@ static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode,
		sdhci_reset_tuning(host);
		}

		static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
		int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
		{
		struct sdhci_host *host = mmc_priv(mmc);
		int err = 0;
		@@ -2168,6 +2168,7 @@ out_unlock:

		return err;
		}
		EXPORT_SYMBOL_GPL(sdhci_execute_tuning);

		static int sdhci_select_drive_strength(struct mmc_card *card,
		unsigned int max_dtr, int host_drv,

drivers/mmc/host/sdhci.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -690,6 +690,7 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
		void sdhci_set_bus_width(struct sdhci_host *host, int width);
		void sdhci_reset(struct sdhci_host *host, u8 mask);
		void sdhci_set_uhs_signaling(struct sdhci_host *host, unsigned timing);
		int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode);

		#ifdef CONFIG_PM
		extern int sdhci_suspend_host(struct sdhci_host *host);

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